@S_Alexander I think the comment about no black shirts was more in relation to if we wanted huge prints such as joseki positions. For a small logo, as you have pictured, white paint on a black shirt is fine, but will indeed fade after a few years.

Thanks to all of you for the ideas!
Give us some time to process and we will come back with more

BHydden:

Depending on whether shirts can be customised at order

You should be able to pick what thing (sweathshirt, t-shirt, bag…) and what color you want. And then even relocate/ resize some of the elements.
Also add your own text (if you wanted your nick or whatever) though with a rather limited font selection.

I know and love that image but I think it’s a bad idea to use original art of other people – at least not without paying them credit (I notice that TANGO’s signature is missing from your copy of the Go playing cats!).

Since those shirts will make money for OGS I think TANGO should then also be paid a part of the price, and that will make things complicated.

Can’t be that complicated. Just contact the artist, say it is for spreading the love of the game of Go, ask if OGS can have exclusive rights for the image and give him 40% for all the 10 T-shirts sold, and it will all work out nicely. Everyone wins…

Yeah, I’d buy some OGS merch! I think the designs look great; that 3D goban would be cool on a shirt if it prints well. Also for the minimalists, having the option of a straightforward OGS logo on the front, with perhaps an empty go board on the back ~ could be nice.